Gold rings can be made of various alloys of gold, with different metals added to achieve desired properties such as color, hardness, and durability. The main component, gold, is a naturally occurring element with the chemical symbol Au. Depending on the karat value, which indicates the purity of gold, different amounts of other metals are alloyed with it.

Here are some common substances and mixtures used in gold rings:

1. Pure Gold (24 Karat): This is the purest form of gold and is relatively soft. It is typically not used in jewelry due to its malleability and susceptibility to damage.

2. 18 Karat Gold: This alloy consists of 75% gold and 25% other metals, such as silver, copper, zinc, or nickel. It offers a good balance between purity, durability, and color.

3. 14 Karat Gold: Consisting of 58.3% gold and 41.7% other metals, 14 karat gold is a commonly used alloy for jewelry. It provides greater durability and affordability compared to higher karat options.

4. 10 Karat Gold: With 41.7% gold and 58.3% other metals, 10 karat gold offers a budget-friendly option while still maintaining a significant gold content.

5. White Gold: This alloy achieves a white or silvery appearance by combining gold with metals like palladium, silver, and zinc. It undergoes a process called rhodium plating, which enhances its shine and durability.

6. Rose Gold: By alloying gold with copper, a pink or rose-colored gold is created. The copper content can vary, resulting in different shades of rose gold.

7. Green Gold: Gold can be alloyed with silver, zinc, or cadmium to create a greenish hue. It is less commonly used compared to other gold colors.

8. Tri-color Gold: This refers to jewelry that combines yellow gold, white gold, and rose gold in a single piece. Each section is made from a different alloy composition.

When selecting a gold ring, it's essential to consider factors such as personal preference, durability, and budget. Different alloys offer variations in color, strength, and purity, allowing individuals to choose a ring that suits their style and requirements.